Means for cooling dynamo-electric machines.



H. RODS.

MEANS FOR 000mm DYNAMO ELEGTRIG MACHINES.

APPLICATION FILED DEC. 8, 1909.

Patented Aug. 15, 1911.

JZSZSZENTUR HERA IAN B005. 3932 a J/IZZTNE'SEES;

iininii STATES PATENT oFFior..-

A CORPORATION OF NEVV'YORK.

MEANS CCOLING DYNAI1E0-ELECTRIC MACHINES.

To all whom it may concern:

' Be it known that I, Hninunn Boos, a subject' of the Emperor ofGermany, residing at Berlin, G-ennany, have invented certain new anduseful Improvements in Means for whereby the heat generated during theiroperation may be carried away in a quick and effective manner.

present invention relates to a cooling that described machines such asmeans for dynamo-electric in my Patents Nos. 957,102,

and 957,103, dated May a, 1910.

1 .In' my patents abovereferred to, the stator oi the dynamo-electricmachine has radial inlet and outlet spaces connected by axial channels,and the stream of air which is i conveyed to and from eachof the axialchannels in the stator is not separated from the streams flowing to andfrom the adjacent axial channels. In certain cases this might lead toanunequal distribution of the air because of eddy currents so thatcertain axial channels receive a larger amount of air than others,' andthus the cooling eiiect'will not be the same in different parts of themachine.

According to my present invention the space blocks in the radialventilating spaces form channels separated from each other so that thestream of cooling fluid in each channel in the radial spaces has a paththrough sthe axial channels which is completely closed against the othercurrents of cooling fluid,

an'dficonse uentl' the different currents do not interfere with eachother.

My invention further consists in certain novel" features of constructionwhich will be pointedoutwith particularity in the claims ppended toandforming a part of this specification. 1

For a better understanding of my invention reference may be had to thefollowing detailed description taken in connection with the accompanyingdrawing, in which Figure l is a cross-section of a dynamoelectricmachine embodying my invention on the lines; 1-1 and 1--1 of Figs. 2 and3,

I respectively; Fig. 2 is a vertical section on the line 22 ofFig. 1;and Fig. 3 is a sum- Specification of Letters Patent.

Application filed December 8, 1909.

Patented Aug. 15, 1911, Serial No. 531,933.

lar section on the line 3-3.' For the sake of clearness, in Fig. 1 theintersection of the space blocks by the lines 11 and 1*"1 has beenomitted.

Referring to the drawing, the laminations are divided into bundlesseparated by radial inlet and outlet ventilating spaces 2 and :2. Theseventilating spaces are connected together by the axial channels 3 formedin the bundles of laminations.

5, 5 are coils of the stator windings and 6 the cast iron casing of thestator.

The radial inlet ventilating spaces 2 are connected with the inletchambers 9 formed in ,the using and the radial exit ventilating spacesare connected with the outlet chambers 10 also formed in the casing. Thelatter chambers have openings'8 and are separated from the inletchambers by ribs 7. In the embodiment of my invention shown in thedrawing there are six inlet chambers 9 and six outlet chambers 10 whichare distributed uniformly and alternately about the periphery oi thestator in an axial direction. In each of the radial inlet spaces 2 thereare formed inlet channels 11 which are separated from each other bysuitably formed space blocks 12. These inlet channels 11 are closed on'the inner periphery of the stator by means of space blocks 13, so thatno air from the air gap or from the rotor can pass into the inletchannels and thereby cause disturbances in the flow of air. The'end ofeach channel 11 which is closed against the rotary member communicateswith one of the axial channels 3 and thus serves fox-supplying air toonly one axial channel. After,

flowing through the axial channel the air passes into one of the outletchannels .14 in the outlet ventilating spaces 2. The outletchannels 14are separated from each other as are the inlet channels ll by means ofspecially formed space blocks 12. These exit HERMAN races, on BER-LIN,GERMANY, ASSIGNOR T0 GENERAL ELECTRIC COMPANY,

' and the discharge channels are of unequal length. 'Since the inletchannels 11 and outletschannels '14: are shifted into different outletchannels. Such anarrangement may also-be used in connection with anarrangement in which short and long channels are connected together. Theair outlet spaces 2 and the channels 14: therein are not closed on theinner periphery of the stator, but are separated from the inlet chambersby means of members 15, which stretch over the entire arc included bythe inletchambers.

The cooling air is drawn from the exterior of the machine into entrancechainbers 16 situated at both. ends of the machine, by fans 17 anddriven against the coils 5, from there to the inlet chambers 9, thencethrough the inlet channels 11 in the inlet spaces 2, through the axialchannels 3, through the exit channels let in the exitspaces 2, and intothe exit chambers 10, passing from there through the openings 8 into theopen air.

The terms stator and rotor are used throughout the specification intheir broad sense of stationary and rotary members.

In the particular construction shown, each inlet and outlet channelcommunicates with a single axial channel, but this is not necessary,andI desire it to be understood that my invention is not limited to theparticular construct-ion shown and described, and aim in the appendedclaims to cover all modilications which do not depart from the spirit ofmy invention.

\Vhat Iclaim as new and desire to secure by Letters Patent of the UnitedStates, is:

1. In a dynamo-electric machine, a stationary laminated core body havingradial inlet and outlet ventilating spaces and axial channels connectingsaid spaces, a casing having axially extending inlet and outletchambersdistributed alternately about the periphery of said core bndy,and space blocks in said ventilating spaces forming channels separatedfrom each other, said channels in the inlet spaces connecting with theinlet chambers and said channels in the outlet spaces connecting withsaid outlet chambers.

2. In a dynamo-electric machine, a stationary laminated core body havinginlet and outlet ventilating spaces and axial channels connecting saidspaces, a casing .having axially extending inlet and outlet chambersdistributed alternately about the periphery of said core body,separating blocksto close the outlet ventilating spaces against theinlet chambers,- and space blocks in said ventilating spaces formingchannels separated from each other, said channels in the inlet spacesconnecting with the inlet chambers and said-channels in the outletspaces connecting with said. outlet chambers.

In a dynamo-electric machine, a stationary laminated core body having.inlet and outlet' ventilating spaces and axial channels connecting saidspaces, a casing having axially extending inlet and outlet chambersdistributed alternately about the periphery of said core body,separating blocks to close the outlet ventilating spaces against theinlet chambers, space blocks for closing the inlet ventilating spaces onthe inner periphery of the core body, and space blocks in saidventilating spaces forming channels separated from each other, saidchannels in the inlet spaces connecting with the inlet chambers and saidchannels in the outlet spaces connecting with said outlet chan'ibers.

St. In. a dynamo-electric machine, a casing having; a plurality of inletchambers and a lurality of outlet chambers, a stationary laminated corebody having radial inlet and outlet ventilating spaces and'a-xialchannels connecting said spaces, said inlet and out let chambers beingdistributed alternately about said core body, and space blocks in theventilating spaces' forming channels separated trom each other, saidchannels in the inlet spaces communicating with the inlet chambers andsaid channels in the' outlet spaces communicating with said outletchambers. I

5. In a dynamo-electric machine, a casing having a plurality of inletchambers and a plurality of outletchambers, a stationary laminated corebody having radial inlet and outlet ventilating spaces and axialchannels connecting said spaces, said inlet and outlet chambers beingdistributed alternately about said core body in an axial direction, andspace blocks in the ventilating spaces forming channels separated fromeach other, said channels in the inlet spaces communicating with theinlet chambers and said channels in the outlet spaces communicating withsaid outlet chambers, said space blocks completely closing the path ofthe stream of cooling fluid in each channel in the radial spaces to eachof the axial channels against the other currents of cooling fluid. v

6. In a dynamo-electric machine, a casing having a plurality of inletchambers and a plurality of outlet chambers, a stationary' vabout saidcore body, and space blocks in channels and shorter inlet channels with10 the'ventilating spaces forming inlet and outlonger outlet channels.

let channels of different lengths and sepa- In Witness whereof, I havehereunto set yated. fro'meach other, said channels in the my hand, this18th day of November, 1909. 5 1nlet spaces communicating with the inletchambefsand said channels in the outlet HERMAN ROOS' xsfiaces'co'mlnunicating with said outlet W'itnesses: c ambers, 583d axialchannels connecting KARL SULZBERGER,

longer 'inlet channels with shorter outlet Tnnonon SAHRIG.

